That said, I'm open to any ideas on this one. Were manpower, machinery, and money no object, was there even a chance to save John Jones?
Maybe drill around him
Due to the tight space, they didn't have much room for anything more than small hand tools. That and pretty much any air-powered drill is going to create so much dust and debris that'll need to be removed it's hard to imagine how it could be removed from the tunnel there- that is if you can even get power tools in there.
Like I say, this one is quite the puzzle.